src/cc/trees/layer_tree_host.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_TREES_LAYER_TREE_HOST_H_
   6 #define CC_TREES_LAYER_TREE_HOST_H_
   7
   8 #include <limits>
   9 #include <list>
  10 #include <set>
  11 #include <string>
  12 #include <vector>
  13
  14 #include "base/basictypes.h"
  15 #include "base/cancelable_callback.h"
  16 #include "base/containers/hash_tables.h"
  17 #include "base/memory/ref_counted.h"
  18 #include "base/memory/scoped_ptr.h"
  19 #include "base/memory/weak_ptr.h"
  20 #include "base/time/time.h"
  21 #include "base/timer/timer.h"
  22 #include "cc/animation/animation_events.h"
  23 #include "cc/base/cc_export.h"
  24 #include "cc/base/scoped_ptr_vector.h"
  25 #include "cc/base/swap_promise.h"
  26 #include "cc/base/swap_promise_monitor.h"
  27 #include "cc/debug/micro_benchmark.h"
  28 #include "cc/debug/micro_benchmark_controller.h"
  29 #include "cc/input/input_handler.h"
  30 #include "cc/input/scrollbar.h"
  31 #include "cc/input/top_controls_state.h"
  32 #include "cc/layers/layer_lists.h"
  33 #include "cc/output/output_surface.h"
  34 #include "cc/resources/resource_format.h"
  35 #include "cc/resources/scoped_ui_resource.h"
  36 #include "cc/trees/layer_tree_host_client.h"
  37 #include "cc/trees/layer_tree_host_common.h"
  38 #include "cc/trees/layer_tree_settings.h"
  39 #include "cc/trees/occlusion_tracker.h"
  40 #include "cc/trees/proxy.h"
  41 #include "third_party/skia/include/core/SkColor.h"
  42 #include "ui/gfx/rect.h"
  43
  44 namespace cc {
  45
  46 class AnimationRegistrar;
  47 class HeadsUpDisplayLayer;
  48 class Layer;
  49 class LayerTreeHostImpl;
  50 class LayerTreeHostImplClient;
  51 class LayerTreeHostSingleThreadClient;
  52 class PrioritizedResource;
  53 class PrioritizedResourceManager;
  54 class Region;
  55 class RenderingStatsInstrumentation;
  56 class ResourceProvider;
  57 class ResourceUpdateQueue;
  58 class SharedBitmapManager;
  59 class TopControlsManager;
  60 class UIResourceRequest;
  61 struct RenderingStats;
  62 struct ScrollAndScaleSet;
  63
  64 // Provides information on an Impl's rendering capabilities back to the
  65 // LayerTreeHost.
  66 struct CC_EXPORT RendererCapabilities {
  67   RendererCapabilities(ResourceFormat best_texture_format,
  68                        bool allow_partial_texture_updates,
  69                        bool using_offscreen_context3d,
  70                        int max_texture_size,
  71                        bool using_shared_memory_resources);
  72
  73   RendererCapabilities();
  74   ~RendererCapabilities();
  75
  76   // Duplicate any modification to this list to RendererCapabilitiesImpl.
  77   ResourceFormat best_texture_format;
  78   bool allow_partial_texture_updates;
  79   bool using_offscreen_context3d;
  80   int max_texture_size;
  81   bool using_shared_memory_resources;
  82 };
  83
  84 class CC_EXPORT LayerTreeHost {
  85  public:
  86   // The SharedBitmapManager will be used on the compositor thread.
  87   static scoped_ptr<LayerTreeHost> CreateThreaded(
  88       LayerTreeHostClient* client,
  89       SharedBitmapManager* manager,
  90       const LayerTreeSettings& settings,
  91       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
  92
  93   static scoped_ptr<LayerTreeHost> CreateSingleThreaded(
  94       LayerTreeHostClient* client,
  95       LayerTreeHostSingleThreadClient* single_thread_client,
  96       SharedBitmapManager* manager,
  97       const LayerTreeSettings& settings);
  98   virtual ~LayerTreeHost();
  99
 100   void SetLayerTreeHostClientReady();
 101
 102   void set_needs_filter_context() { needs_filter_context_ = true; }
 103   bool needs_offscreen_context() const {
 104     return needs_filter_context_;
 105   }
 106
 107   // LayerTreeHost interface to Proxy.
 108   void WillBeginMainFrame() {
 109     client_->WillBeginMainFrame(source_frame_number_);
 110   }
 111   void DidBeginMainFrame();
 112   void UpdateClientAnimations(base::TimeTicks monotonic_frame_begin_time);
 113   void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
 114   void DidStopFlinging();
 115   void Layout();
 116   void BeginCommitOnImplThread(LayerTreeHostImpl* host_impl);
 117   void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
 118   void WillCommit();
 119   void CommitComplete();
 120   scoped_ptr<OutputSurface> CreateOutputSurface();
 121   virtual scoped_ptr<LayerTreeHostImpl> CreateLayerTreeHostImpl(
 122       LayerTreeHostImplClient* client);
 123   void DidLoseOutputSurface();
 124   bool output_surface_lost() const { return output_surface_lost_; }
 125   enum CreateResult {
 126     CreateSucceeded,
 127     CreateFailedButTryAgain,
 128     CreateFailedAndGaveUp,
 129   };
 130   virtual CreateResult OnCreateAndInitializeOutputSurfaceAttempted(
 131       bool success);
 132   void DidCommitAndDrawFrame() { client_->DidCommitAndDrawFrame(); }
 133   void DidCompleteSwapBuffers() { client_->DidCompleteSwapBuffers(); }
 134   void DeleteContentsTexturesOnImplThread(ResourceProvider* resource_provider);
 135   virtual void AcquireLayerTextures();
 136   // Returns false if we should abort this frame due to initialization failure.
 137   bool InitializeOutputSurfaceIfNeeded();
 138   bool UpdateLayers(ResourceUpdateQueue* queue);
 139
 140   LayerTreeHostClient* client() { return client_; }
 141   const base::WeakPtr<InputHandler>& GetInputHandler() {
 142     return input_handler_weak_ptr_;
 143   }
 144
 145   void NotifyInputThrottledUntilCommit();
 146
 147   void Composite(base::TimeTicks frame_begin_time);
 148
 149   // Composites and attempts to read back the result into the provided
 150   // buffer. If it wasn't possible, e.g. due to context lost, will return
 151   // false.
 152   bool CompositeAndReadback(void* pixels,
 153                             const gfx::Rect& rect_in_device_viewport);
 154
 155   void FinishAllRendering();
 156
 157   void SetDeferCommits(bool defer_commits);
 158
 159   // Test only hook
 160   virtual void DidDeferCommit();
 161
 162   int source_frame_number() const { return source_frame_number_; }
 163
 164   void SetNeedsDisplayOnAllLayers();
 165
 166   void CollectRenderingStats(RenderingStats* stats) const;
 167
 168   RenderingStatsInstrumentation* rendering_stats_instrumentation() const {
 169     return rendering_stats_instrumentation_.get();
 170   }
 171
 172   const RendererCapabilities& GetRendererCapabilities() const;
 173
 174   void SetNeedsAnimate();
 175   virtual void SetNeedsUpdateLayers();
 176   virtual void SetNeedsCommit();
 177   virtual void SetNeedsFullTreeSync();
 178   void SetNeedsRedraw();
 179   void SetNeedsRedrawRect(const gfx::Rect& damage_rect);
 180   bool CommitRequested() const;
 181   bool BeginMainFrameRequested() const;
 182
 183   void SetNextCommitWaitsForActivation();
 184
 185   void SetNextCommitForcesRedraw();
 186
 187   void SetAnimationEvents(scoped_ptr<AnimationEventsVector> events,
 188                           base::Time wall_clock_time);
 189
 190   void SetRootLayer(scoped_refptr<Layer> root_layer);
 191   Layer* root_layer() { return root_layer_.get(); }
 192   const Layer* root_layer() const { return root_layer_.get(); }
 193   const Layer* page_scale_layer() const { return page_scale_layer_.get(); }
 194   void RegisterViewportLayers(
 195       scoped_refptr<Layer> page_scale_layer,
 196       scoped_refptr<Layer> inner_viewport_scroll_layer,
 197       scoped_refptr<Layer> outer_viewport_scroll_layer);
 198   Layer* inner_viewport_scroll_layer() const {
 199     return inner_viewport_scroll_layer_.get();
 200   }
 201   Layer* outer_viewport_scroll_layer() const {
 202     return outer_viewport_scroll_layer_.get();
 203   }
 204
 205   const LayerTreeSettings& settings() const { return settings_; }
 206
 207   void SetDebugState(const LayerTreeDebugState& debug_state);
 208   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 209
 210   void SetViewportSize(const gfx::Size& device_viewport_size);
 211   void SetOverdrawBottomHeight(float overdraw_bottom_height);
 212
 213   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 214   float overdraw_bottom_height() const { return overdraw_bottom_height_; }
 215
 216   void ApplyPageScaleDeltaFromImplSide(float page_scale_delta);
 217   void SetPageScaleFactorAndLimits(float page_scale_factor,
 218                                    float min_page_scale_factor,
 219                                    float max_page_scale_factor);
 220   float page_scale_factor() const { return page_scale_factor_; }
 221
 222   SkColor background_color() const { return background_color_; }
 223   void set_background_color(SkColor color) { background_color_ = color; }
 224
 225   void set_has_transparent_background(bool transparent) {
 226     has_transparent_background_ = transparent;
 227   }
 228
 229   void SetOverhangBitmap(const SkBitmap& bitmap);
 230
 231   PrioritizedResourceManager* contents_texture_manager() const {
 232     return contents_texture_manager_.get();
 233   }
 234
 235   void SetVisible(bool visible);
 236   bool visible() const { return visible_; }
 237
 238   void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
 239                                bool use_anchor,
 240                                float scale,
 241                                base::TimeDelta duration);
 242
 243   void ApplyScrollAndScale(const ScrollAndScaleSet& info);
 244   gfx::Vector2d DistributeScrollOffsetToViewports(const gfx::Vector2d offset,
 245                                                   Layer* layer);
 246
 247   void SetImplTransform(const gfx::Transform& transform);
 248
 249   // Virtual for tests.
 250   virtual void StartRateLimiter();
 251   virtual void StopRateLimiter();
 252
 253   void RateLimit();
 254
 255   bool AlwaysUsePartialTextureUpdates();
 256   size_t MaxPartialTextureUpdates() const;
 257   bool RequestPartialTextureUpdate();
 258
 259   void SetDeviceScaleFactor(float device_scale_factor);
 260   float device_scale_factor() const { return device_scale_factor_; }
 261
 262   void UpdateTopControlsState(TopControlsState constraints,
 263                               TopControlsState current,
 264                               bool animate);
 265
 266   HeadsUpDisplayLayer* hud_layer() const { return hud_layer_.get(); }
 267
 268   Proxy* proxy() const { return proxy_.get(); }
 269
 270   AnimationRegistrar* animation_registrar() const {
 271     return animation_registrar_.get();
 272   }
 273
 274   // Obtains a thorough dump of the LayerTreeHost as a value.
 275   scoped_ptr<base::Value> AsValue() const;
 276
 277   bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
 278
 279   // CreateUIResource creates a resource given a bitmap.  The bitmap is
 280   // generated via an interface function, which is called when initializing the
 281   // resource and when the resource has been lost (due to lost context).  The
 282   // parameter of the interface is a single boolean, which indicates whether the
 283   // resource has been lost or not.  CreateUIResource returns an Id of the
 284   // resource, which is always positive.
 285   virtual UIResourceId CreateUIResource(UIResourceClient* client);
 286   // Deletes a UI resource.  May safely be called more than once.
 287   virtual void DeleteUIResource(UIResourceId id);
 288   // Put the recreation of all UI resources into the resource queue after they
 289   // were evicted on the impl thread.
 290   void RecreateUIResources();
 291
 292   virtual gfx::Size GetUIResourceSize(UIResourceId id) const;
 293
 294   bool UsingSharedMemoryResources();
 295   int id() const { return id_; }
 296
 297   bool ScheduleMicroBenchmark(const std::string& benchmark_name,
 298                               scoped_ptr<base::Value> value,
 299                               const MicroBenchmark::DoneCallback& callback);
 300
 301   // When a SwapPromiseMonitor is created on the main thread, it calls
 302   // InsertSwapPromiseMonitor() to register itself with LayerTreeHost.
 303   // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
 304   // to unregister itself.
 305   void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 306   void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 307
 308   // Call this function when you expect there to be a swap buffer.
 309   // See swap_promise.h for how to use SwapPromise.
 310   void QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise);
 311
 312   void BreakSwapPromises(SwapPromise::DidNotSwapReason reason);
 313
 314  protected:
 315   LayerTreeHost(LayerTreeHostClient* client,
 316                 SharedBitmapManager* manager,
 317                 const LayerTreeSettings& settings);
 318   void InitializeThreaded(
 319       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
 320   void InitializeSingleThreaded(
 321       LayerTreeHostSingleThreadClient* single_thread_client);
 322   void InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing);
 323   void SetOutputSurfaceLostForTesting(bool is_lost) {
 324     output_surface_lost_ = is_lost;
 325   }
 326
 327   MicroBenchmarkController micro_benchmark_controller_;
 328
 329  private:
 330   void InitializeProxy(scoped_ptr<Proxy> proxy);
 331
 332   void PaintLayerContents(
 333       const RenderSurfaceLayerList& render_surface_layer_list,
 334       ResourceUpdateQueue* queue,
 335       bool* did_paint_content,
 336       bool* need_more_updates);
 337   void PaintMasksForRenderSurface(Layer* render_surface_layer,
 338                                   ResourceUpdateQueue* queue,
 339                                   bool* did_paint_content,
 340                                   bool* need_more_updates);
 341   bool UpdateLayers(Layer* root_layer, ResourceUpdateQueue* queue);
 342   void UpdateHudLayer();
 343   void TriggerPrepaint();
 344
 345   void ReduceMemoryUsage();
 346
 347   void PrioritizeTextures(
 348       const RenderSurfaceLayerList& render_surface_layer_list,
 349       OverdrawMetrics* metrics);
 350   void SetPrioritiesForSurfaces(size_t surface_memory_bytes);
 351   void SetPrioritiesForLayers(const RenderSurfaceLayerList& update_list);
 352   size_t CalculateMemoryForRenderSurfaces(
 353       const RenderSurfaceLayerList& update_list);
 354
 355   bool AnimateLayersRecursive(Layer* current, base::TimeTicks time);
 356
 357   struct UIResourceClientData {
 358     UIResourceClient* client;
 359     gfx::Size size;
 360   };
 361
 362   typedef base::hash_map<UIResourceId, UIResourceClientData>
 363       UIResourceClientMap;
 364   UIResourceClientMap ui_resource_client_map_;
 365   int next_ui_resource_id_;
 366
 367   typedef std::list<UIResourceRequest> UIResourceRequestQueue;
 368   UIResourceRequestQueue ui_resource_request_queue_;
 369
 370   void CalculateLCDTextMetricsCallback(Layer* layer);
 371
 372   void NotifySwapPromiseMonitorsOfSetNeedsCommit();
 373
 374   bool animating_;
 375   bool needs_full_tree_sync_;
 376   bool needs_filter_context_;
 377
 378   base::CancelableClosure prepaint_callback_;
 379
 380   LayerTreeHostClient* client_;
 381   scoped_ptr<Proxy> proxy_;
 382
 383   int source_frame_number_;
 384   scoped_ptr<RenderingStatsInstrumentation> rendering_stats_instrumentation_;
 385
 386   bool output_surface_can_be_initialized_;
 387   bool output_surface_lost_;
 388   int num_failed_recreate_attempts_;
 389
 390   scoped_refptr<Layer> root_layer_;
 391   scoped_refptr<HeadsUpDisplayLayer> hud_layer_;
 392
 393   scoped_ptr<PrioritizedResourceManager> contents_texture_manager_;
 394   scoped_ptr<PrioritizedResource> surface_memory_placeholder_;
 395
 396   base::WeakPtr<InputHandler> input_handler_weak_ptr_;
 397   base::WeakPtr<TopControlsManager> top_controls_manager_weak_ptr_;
 398
 399   const LayerTreeSettings settings_;
 400   LayerTreeDebugState debug_state_;
 401
 402   gfx::Size device_viewport_size_;
 403   float overdraw_bottom_height_;
 404   float device_scale_factor_;
 405
 406   bool visible_;
 407
 408   base::OneShotTimer<LayerTreeHost> rate_limit_timer_;
 409
 410   float page_scale_factor_;
 411   float min_page_scale_factor_;
 412   float max_page_scale_factor_;
 413   gfx::Transform impl_transform_;
 414   bool trigger_idle_updates_;
 415
 416   SkColor background_color_;
 417   bool has_transparent_background_;
 418
 419   // If set, this texture is used to fill in the parts of the screen not
 420   // covered by layers.
 421   scoped_ptr<ScopedUIResource> overhang_ui_resource_;
 422
 423   typedef ScopedPtrVector<PrioritizedResource> TextureList;
 424   size_t partial_texture_update_requests_;
 425
 426   scoped_ptr<AnimationRegistrar> animation_registrar_;
 427
 428   struct PendingPageScaleAnimation {
 429     gfx::Vector2d target_offset;
 430     bool use_anchor;
 431     float scale;
 432     base::TimeDelta duration;
 433   };
 434   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 435
 436   bool in_paint_layer_contents_;
 437
 438   static const int kTotalFramesToUseForLCDTextMetrics = 50;
 439   int total_frames_used_for_lcd_text_metrics_;
 440
 441   struct LCDTextMetrics {
 442     LCDTextMetrics()
 443         : total_num_cc_layers(0),
 444           total_num_cc_layers_can_use_lcd_text(0),
 445           total_num_cc_layers_will_use_lcd_text(0) {}
 446
 447     int64 total_num_cc_layers;
 448     int64 total_num_cc_layers_can_use_lcd_text;
 449     int64 total_num_cc_layers_will_use_lcd_text;
 450   };
 451   LCDTextMetrics lcd_text_metrics_;
 452   int id_;
 453   bool next_commit_forces_redraw_;
 454
 455   scoped_refptr<Layer> page_scale_layer_;
 456   scoped_refptr<Layer> inner_viewport_scroll_layer_;
 457   scoped_refptr<Layer> outer_viewport_scroll_layer_;
 458
 459   SharedBitmapManager* shared_bitmap_manager_;
 460
 461   ScopedPtrVector<SwapPromise> swap_promise_list_;
 462   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 463
 464   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 465 };
 466
 467 }  // namespace cc
 468
 469 #endif  // CC_TREES_LAYER_TREE_HOST_H_